Octopus (Human Slinky) - S4E6 - The Brian Conley Show

I'm pretty confident this is Veniamin's Human Slinky, but if it isn't, here's somebody else doing it first in a far duller costume.
From Series 4 Episode 6 of The Brian Conley Show (c.1995)
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[@MariusIonescu]

Clearly Veniamin! It's the suit used in the early years(scared the shit out of my childhood...).

[@danielwilliamson6180]

Extraordinary!